KR19980052533A - Endmark defect removal device and method of cold rolled steel sheet - Google Patents

Abstract

The present invention relates to an apparatus and method for removing end-mark defects due to the thickness of the first coil steel sheet which occurs on the coil steel sheet wound after the second due to the thickness of the steel sheet when the cold rolled steel sheet is finally coiled. In more detail, when the coil is continuously wound on the coil winding machine by installing the coil in front of the coil winding machine and inclining the cold rolled steel sheet tip in the thickness direction to make the thickness thinner, the end mark defect due to the thickness of the first coil steel sheet (bending marks The present invention relates to an apparatus and a method capable of eliminating a defect).

The present invention is to remove the end mark defect of the cold rolled steel sheet in order to remove the end mark generated during the winding of the cold rolled steel sheet by inclining the tip of the cold rolled steel sheet inclined at the front end of the winding machine of the cold rolled continuous line so as not to generate the end mark. And methods.

According to the present invention, it is possible to produce a cold rolled coil having no end mark defect by completely solving the problem of cutting off the defective part by generating an end mark defect of 2 tons per coil (8-15 tons) generated during winding of the cold rolled steel sheet. In addition, it is possible to adjust the inclined processing angle and the processing width for each thickness of the steel sheet, or to selectively produce a cold rolled product of good quality by passing through the process, as well as to greatly improve the error rate.

Description

Apparatus and method for removing end mark defects of cold rolled steel.

The present invention relates to an apparatus and method for removing end-mark defects due to the thickness of the first coil steel sheet which occurs on the coil steel sheet wound after the second due to the thickness of the steel sheet when the cold rolled steel sheet is finally coiled. In more detail, in the case where the coil is installed in front of the coil winding machine and the end of the cold rolled steel sheet is inclined in the thickness direction to reduce the thickness, the coil is wound continuously with the coil winding machine. And apparatus and method capable of removing

In general, the end mark (K) of the cold rolled steel sheet (S) is the first steel coil coiled by the tension applied to the cold rolled steel sheet (S) when winding the cold rolled steel sheet (S) in the winder 220 as shown in FIG. Because of the thickness of the second winding, the coil is continuously pressed down by one place on one winding coil. The end mark K is a cold rolled steel sheet having a thickness of 0.8 mm to 2.3 mm and a width of 610 mm to 1,850 mm of the steel sheet S, and a winding machine 220 is conventionally used to reduce the end mark K. Although a method of processing a groove in a rubber sleeve (not shown) used for the first coil steel sheet S into the groove is used, the sleeve stop position of the winder 220 is the first entry steel sheet ( There is a problem that can not be carried out because it does not fit S).

The present invention is to solve the conventional problems as described above, in the continuous cold rolling process can automatically detect the tip of the cold-rolled steel sheet, the inclined cutting process and the plate can be continuously, inclined processing angle and processing by the thickness of the steel sheet It is an object of the present invention to provide an end mark defect removal device and a method for removing cold-rolled steel sheet by adjusting the width or selectively passing through it to remove the end mark from the cold-rolled product.

1 is a block diagram of a cold rolling facility equipped with an end mark defect removing device of the present invention,

Figure 2 is a front view showing an end mark defect removal apparatus of a cold rolled steel sheet according to the present invention,

Figure 3 is a side cross-sectional view showing an end mark defect removal device of a cold rolled steel sheet according to the present invention,

Figure 4 is a cross-sectional view showing a steel plate cutting operation of the end mark defect removal device of the cold rolled steel sheet according to the present invention,

5 is a cross-sectional plan view showing a steel plate front end detection portion of the end mark defect removal device of the cold rolled steel sheet according to the present invention;

Figure 6 is a longitudinal cross-sectional view showing a steel plate front end detection portion of the end mark defect removal device of the cold rolled steel sheet according to the present invention;

7 is an explanatory view showing a situation of removing the end mark defect of the cold rolled steel sheet according to the present invention;

8 is an explanatory diagram showing a situation where a defect of an end mark occurs when the cold rolled steel sheet is wound in accordance with the prior art;

Figure 9 is a flow chart illustrating a step-by-step method for removing the end mark defect of the cold rolled steel sheet according to the present invention.

* Description of the symbols for the main parts of the drawings *

10 main body 12 square frame

16: base 20: servo motor

24a: Pinion Gear 24b: Rack Gear

30: lifting frame 36: hydraulic cylinder

40: cut steel sheet 46: motor

48: milling cutter 50: dust cover

52: open and close cylinder 58: clamp portion

66b: Air injection nozzle 70: Steel plate tip detection part

73: rotating plate 75: rotary actuator

78: encoder 80: safety lock

90 control unit 210 cutter

220: winding machine K: end mark

S: steel plate

In order to achieve the above object, the present invention, in the device for removing the end mark generated during the winding of the cold-rolled steel sheet, provided with a frame of a rectangular structure disposed in the width direction of the steel plate progress line, the base A main body portion having a servo motor and a gear connecting mechanism for moving back and forth in a traveling direction of the steel sheet on a guide of the steel sheet; A steel plate detector mounted at a front end of the rectangular frame and having a light emitter and a light receiver disposed above and below the steel plate to detect that the steel sheet flows into the main body; A lifting frame which is vertically guided on a guide positioned on the inside of the square frame and disposed vertically on the inside of the square frame, wherein the lifting frame moves up and down by a hydraulic unit and a hydraulic cylinder disposed on an upper side of the square frame; It is provided with a cutter frame movable in the width direction of the steel plate with respect to the elevating frame, the angle of inclination can be adjusted, the cutter frame is provided with a plurality of motors, the motor has a plurality of milling cutter is disposed in the width direction of the steel plate On the other hand, one side of the elevating frame is a steel plate cutting unit having a hydraulic cylinder for displacing the cutter frame in the width direction of the steel plate; It is movable in the longitudinal direction of the steel plate on the lower side of the square frame, and on both sides is provided with a moving plate which is elastically supported by mounting a spring between the frame, a rotary actuator is mounted in the center of the moving plate, A rotating plate having a rotating plate rotatable to an upper side of the transfer line of the steel plate, while a piano line extends to the rear side of the moving plate and connected to the encoder to detect the line unit value of the steel plate; A clamp unit attached to the cutter frame and having a pressing plate capable of raising and lowering up and down to closely contact the steel plate with the square frame when the cutter frame is lowered; An air injection unit equipped with an air supply pipe mounted to the cutter frame and a plurality of air injection nozzles connected thereto to remove the cutting chip from the steel sheet during the cutting operation by the milling cutter; A mail order table having a plurality of rollers which are moved up and down at a lower portion of the steel sheet and a cylinder which raises and lowers them to allow the steel sheet to flow through; A lock unit having a cylinder mounted on one side of the square frame, and the rod of the cylinder entering and exiting a hole formed on the side of the lifting frame to fix the lifting frame of the lifting frame with respect to the square frame; And a control part electrically connected to the steel plate detecting unit and the steel plate front end detecting unit and automatically controlling the motor and the hydraulic cylinder to cut the front end of the steel sheet at a predetermined angle of inclination. By providing a defect elimination device.

In addition, in the present invention, the method for removing the end mark generated during the winding of the cold rolled steel sheet, including the step of processing the leading end of the cold rolled steel sheet inclined at the winding machine front end of the cold rolling continuous line is not generated after the end mark. By devising a method for removing the end mark defect of the cold rolled steel sheet.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

The end mark defect removing device 1 of the cold rolled steel sheet according to the present invention is located on the wake side of the pinch roll 205 and the cutter 210 in the steel sheet S traveling line, as shown in FIG. And a main body portion 10 positioned upstream of the deflector roll 212 and the winder 220 in the width direction of the steel sheet S, the main body portion 10 being shown in FIG. As described above, a frame 12 having a rectangular structure is provided, and the frame 12 is provided with a front plate table 14a positioned at a lower portion of the traveling line of the steel sheet S, and the square frame 12 has a lower surface. It is mounted on the guide 18 of the base 16 located in the advancing direction of the steel sheet S so as to be moved forward and backward, and a servo motor 20 for moving the square frame 12 is disposed on one side. . In addition, the gear connecting mechanism 22 is connected to the rotation shaft 20a of the servo motor 20 so that the square frame 12 can be accurately adjusted to a stop position of the steel sheet S with a tolerance of ± 1 mm as described later. The pinion gear 24a is formed on both sides of the square frame 12, and the gear connecting mechanism 22 is formed on both sides of the lower surface of the square frame 12, respectively. The size word 24b is configured to engage. Accordingly, the rectangular frame 12 may be moved forward and backward in the longitudinal direction of the steel plate S through the plurality of pinion gears 24a and the rack gears 24b by driving the servo motor 20.

In addition, a steel plate detector 26 is mounted at the front end of the rectangular frame 12, and the steel plate detector 26 is disposed above and below the steel sheet S as illustrated in FIG. 3. And a light receiver 28b to form a photo head sensor, and detect that steel sheet S flows into the body portion 10 so as to periodically transmit a signal to the controller 90 to be described later. To transmit.

In addition, the elevating frame 30 is located inside the rectangular frame 12, which is vertically guided on the guide 32 vertically disposed inside the rectangular frame 12, and the upper portion of the rectangular frame 12. The hydraulic unit 34 and the hydraulic cylinder 36 arranged on the side are configured to move up and down. That is, the lifting frame 30 is connected to the rod (36a) of the plurality of hydraulic cylinders 36 arranged vertically on the upper side of the rectangular frame 12 is raised and lowered by the operation of the hydraulic cylinder (36) It is done.

Then, the lower portion of the elevating frame 30, the steel plate cutting portion 40 which moves up and down with the elevating frame 30 is located, which is in the width direction of the steel plate (S) relative to the elevating frame (30) It is provided with a fixed plate 42 which is slidably connected to a plurality of guides 41 mounted on the lower surface of the elevating frame 30 so as to move freely, and the fixed plate 42 has a cutter frame freely adjustable inclination angle ( 44 is connected. In addition, the cutter frame 44 is equipped with a plurality of motors 46 extending side by side in the width direction of the steel plate (S), the motor 46 has a plurality of milling cutters 48 of the steel plate (S) The dust cover 50 is disposed at a predetermined interval in the width direction, and the dust cover 50 which prevents the processing chip from scattering during cutting of the steel sheet S by the milling cutter 48 to the upper side of each milling cutter 48 is cutter frame. It is formed over the full width of (44). In addition, the dust cover 50 is raised and lowered by the operation of the opening and closing cylinder 52 arranged on the rear side of the cutter frame 44, the opening and closing cylinder 52 to the upper side of the dust cover 50. Link member 54 is extended from the rod 52a of the) is connected so that the dust cover 50 is rotated to the bottom in the lowered state when the lifting frame 32 is lowered during cutting processing, so that the cutting chips are not dispersed To fall to the bottom.

In the above, the fixing plate 42 and the cutter frame 44 are connected to be able to adjust the inclination angle as shown in FIG. 4, which is the upper front side of the cutter frame 44 through the hinge 45a. The push bolt 45b which is connected to the lower front side of the lower side of the 42 so as to be rotatable and protrudes downward from the fixing plate 42 to adjust the length thereof and pressurizes the upper surface of the cutter frame 44. Adjacent to the lower side from the fixing plate 42 to extend to the through-hole 45c of the cutter frame 44, the fixing plate 42 is provided with a support bolt 45e fixed by a nut 45d and held horizontally The mounting angle of the cutter frame 44 may be changed with respect to the cutting angle at which the milling cutter 48 of the motor 46 mounted on the cutter frame 44 is formed with respect to the steel sheet S. To change it.

In addition, the cutter frame 44, the clamp portion 58 is formed in the front side bar, the clamp portion 58 is Equipped with a pressing plate (59b) is connected through the fixing stand (59a) connected in the form is configured to be lowered at the same time when the cutter frame 44 is lowered in close contact with the steel plate (S) between the square frame (12).

On the other hand, one side of the lifting frame 30, as shown in Figure 2, is equipped with a cutter feed cylinder 62 for displacing the cutter frame 44 in the width direction of the steel sheet (S), When the body of the cutter feed cylinder 62 is fixed to the square frame 12, the rod is connected to the cutter frame 44, the cutting of the steel sheet (S) is made, the cutter frame (62) by the cutter feed cylinder (62) 44) and the milling cutter 48 is 200mm in the width direction of the steel sheet (S), each of the ten milling cutter 48 is configured to travel cutting 200mm in the steel plate (S) width direction.

In addition, the air injection unit 65 mounted to the cutter frame 44 is configured to remove the cutting chip from the steel sheet (S) during the cutting operation by the milling cutter 48, which is attached to the cutter frame 44 Equipped with an air supply pipe (66a) and a plurality of air spray nozzles (66b) connected thereto, the tip of the air spray nozzles (66b) extends to the ends of the milling cutter (48) and the cutter cover (48a). .

Then, the steel sheet tip detection unit 70 for detecting the line unit value of the steel sheet (S) at the lower side of the rectangular frame 12 is mounted to the rectangular frame 12, as shown in FIG. A pair of guide rods 72 fitted in the circular guide sphere 71 and a movable plate 73 movable in the longitudinal direction of the steel plate S, and springs 74 on both sides of the movable plate 73. Is mounted between the frame 12 and has a structure that is elastically supported. In addition, a rotary actuator 75 is mounted at the center of the movable plate 73, and a rotary plate 75 is provided on the rotary shaft of the movable plate 73 to protrude upward from the upper side of the transfer line of the steel plate S. The piano wire 77 extends to the rear side and is connected to the encoder 78.

Therefore, when the steel plate tip detection unit 70 as described above is contacted with the rotary plate 76 by the steel plate S advancing toward the upper side of the square frame 12, the rotary plate 76 is moved by the force of the steel plate S. The spring 74 of the moving plate 73 is advanced while being moved together with the steel sheet S, and at the same time, the piano wire 77 is pulled to operate the encoder 78. Accordingly, the encoder 78 transmits an electric signal corresponding to the lead length of the piano wire 77 to the controller 90 to be described later, so that the control unit 90 receives the tip Sa of the steel sheet S. When the rotary plate 76 is recognized and the distance is advanced, and the rotary actuator 75 is operated to rotate the rotary plate 76 downward, the rotary plate 76 and the moving plate 73 are driven by the restoring force of the spring 74. Will be returned to its original position. The controller 90 drives the servomotor 20 to move the square frame 12 of the main body 10 to the front end side of the steel sheet S by the distance input from the encoder 78.

Meanwhile, as shown in FIG. 3, the rear plate table 14b that is lowered up and down on the lower portion of the steel sheet S is in contact with the lower surface of the steel sheet S and is capable of idling a plurality of rollers 14c. And it is provided with a cylinder (14d) to raise and lower it, the plate steel plate (S) is to be, which is the cylinder (14d) is arranged upright in the rear side lower portion of the square frame (12).

In addition, the safety lock portion 80 to prevent the non-cutting lifting and lowering frame 30 of the steel sheet (S) by the milling cutter 48 is mounted to one side of the square frame 12, the cylinder 82 And a rod (not shown) of the cylinder 82 moves in and out of a hole (not shown) formed on the side of the lifting frame 30 to move the lifting frame 30 up and down with respect to the square frame 12. It is configured to be fixed.

The control unit 90 is electrically connected to the steel plate detecting unit 26 and the steel plate front end detecting unit 70 to receive an electrical signal, and automatically operates the plurality of motors and the plurality of hydraulic cylinders through a series of planned programs. By controlling and cutting the front end Sa of the steel sheet S with a plurality of milling cutters 48 at a constant inclination angle, the steel sheet S whose tip is inclined through this cutting processing is wound by the winding machine 220. In the case of winding with a coil, as shown in FIG. 7, no end mark K is formed.

In addition, the control unit 90 separates the cold rolled steel sheet (S) for cutting the end mark (K) and the non-cutting cold rolled steel (S) on the program in the case of the non-cutting cold rolled steel sheet (S), the lifting frame ( 30) to raise the plate (14a, 14b) to raise the cold rolled steel sheet (S) without the cutting process, in the case of the cold-rolled steel sheet (S) for cutting work, the lifting frame 30 is lowered and the plate table ( 14a) 14b is lowered so that the milling cutter 48 can be configured to perform the cutting operation.

Referring to the endmark defect removal method of the cold rolled steel sheet by the apparatus (1) of the present invention configured as described above are as follows. That is, according to the end mark defect removal method of the present invention, in order to remove the end mark (K) generated during the winding of the cold rolled steel sheet (S), the front end portion of the cold rolled steel sheet (S) in front of the winding machine 220 of the cold continuous line It includes the step (100) of processing (Sa) inclined.

As shown in FIG. 9, the presence or absence of the cold rolled steel sheet S is detected by the light emitter 28a and the light receiver 28b of the steel plate detector 26, and an electrical signal indicating that the cold rolled steel sheet S is present. A step 110 is transmitted to the control unit 90, and the control unit 90 receives a signal indicating that the steel plate S has been cut by the cutter 210, which is a peripheral facility, and a signal indicating the steel plate S for processing the end mark K. When received at the same time, the device 1 enters the cutting mode step 112, which is the next step.

The cutting mode step 112 is automatically started, and the rising step 116 of the top end detection unit 70 and the lifting step 114 of the lifting frame 30 are simultaneously made. Then, when the lifting frame 30 reaches the upper limit (Upper Limlt), the step 118 is released to the safety lock unit 80.

Then, when the steel sheet tip detection unit 70 moves forward by the steel plate S tip Sa and stops, the encoder 78 outputs a deviation value between the origin and the stop position to produce the steel sheet S. Detecting the tip Sa (120) is made, the control unit 90 receives the output signal to operate the servo drive motor 20 to move the square frame 12 by the amount of deviation in front of the steel sheet (S) Step 122 is made to move to the side.

In addition, when the positioning of the frame 12 of the main body portion 10 is completed as described above, the dust cover 50 is closed by rotating and closing in a downward direction so that the cutting chip is not scattered 124. The steel plate front end detection unit 70 rotates from the front end of the steel plate to one side by the operation of the rotary actuator 75 so that the steel plate tip detection unit 70 may not cross and interfere with the progressing steel plate S. Step 126 is made.

When all the conditions of the steps 118, 124 and 126 are satisfied, the cutter rotating motor 46 starts to rotate and the milling cutter 48 rotates 130, and the lifting frame 30 A step 132 of descending the inside of the rectangular frame 12 is performed by the hydraulic cylinder 36, and the step 134 of starting the air injection nozzle 66b to blow the compressed air to the cutter 48 side is performed. Is done.

Then, the lifting frame 30, the cutter frame 44 and the ten milling cutters 48 connected thereto are lowered to start the cutting of the steel sheet S (136), and the cutting of the steel sheet S is performed. When it is made, the cutter frame 44 and the milling cutter 48 advance 200 mm in the width direction of the steel plate S by the cutter transfer cylinder 62, and each of the ten milling cutters 48 moves the steel plate S in the width direction. Travel cutting.

On the other hand, when the lifting frame 30 is lowered above, the plate tables 14a and 14b are lowered at the same time as the lifting frame 30, and the back plate table 14b is accompanied by the operation of the cylinder 14d. .

After the driving cutting is completed as described above, the lifting frame 30 is lifted up (step 138), and the air spraying operation for removing the cutting chip from the cutting surface of the steel sheet S raises the lifting frame 30. Continue until complete.

Then, after the lifting of the lifting frame 30 is completed, the milling cutter 48 is raised at the cutting position to return to the origin 140, and the square frame 12 of the main body 10 is at the cutting position. Step 142 is made to return to the origin, the safety lock unit 80 is operated to lock the lifting frame 30 with respect to the square frame 12 is made 144, the dust cover 50 is The step 146 of rotating and opening by the opening and closing cylinder 52 is made at the same time.

When the operation is completed, the completion step 150 of one cycle is processed.

As described above, in the present invention, the end mark defect removal device and the removal method of the present invention completely eliminates the problem of cutting off the defective part by generating 2 ton end mark defects per coil (8-15 tons) generated during winding of the cold rolled steel sheet. By solving the problem, it is possible to produce cold rolled coil without end mark (K) defect, and to adjust the inclined processing speed and processing width according to the thickness of steel plate (S), or to produce cold rolled products of good quality by selectively passing through no processing. Of course, the effect of greatly improving the error rate is obtained.

Claims (10)

In the apparatus for removing the end mark (K) generated during the winding of the cold rolled steel sheet (S), provided with a frame 12 having a rectangular structure arranged in the width direction of the steel sheet (S) progress line, the frame (12) Main body portion 10 having a servo motor 20 and a gear connecting mechanism 22 for moving the back and forth on the guide 18 of the base 16 in the advancing direction of the steel sheet S; Mounted at the front end of the rectangular frame 12, and equipped with a light emitter 28a and a light receiver 28b disposed above and below the steel plate (S) to detect that the inside of the body portion 10 of the steel sheet (S) Steel plate detection unit 26 to be used; A hydraulic unit 34 positioned vertically on the guide 32 positioned inside the square frame 12 and vertically disposed inside the square frame 12, and disposed on an upper side of the square frame 12. Lifting frame 30, the vertical lifting platform is made by the hydraulic cylinder 36; Equipped with a cutter frame 44 that is movable in the width direction of the steel plate (S) with respect to the lifting frame 30, the inclination angle can be adjusted, the cutter frame 44 is provided with a plurality of motors 46, A plurality of milling cutters 48 are disposed in the motor 46 in the width direction of the steel plate S, while one side of the lifting frame 30 has the cutter frame 44 in the width direction of the steel plate S. A steel plate cutting part 40 having a cutter feed cylinder 62 for displacing; A movable plate 73 which is movable in the longitudinal direction of the steel plate S at the lower side of the square frame 12 and is elastically supported by mounting a spring 74 between the frame 12 on both sides thereof. In the center of the moving plate 73, a rotary actuator 75 is mounted, the rotating shaft is provided with a rotating plate 76 which can be rotated to the upper side of the transfer line of the steel plate (S), while the rear of the moving plate 73 A steel plate tip detection unit 70 for detecting a line unit value of the steel sheet S by extending the piano wire 77 and being connected to the encoder 78 on the side; The clamp unit 58 is attached to the cutter frame 12 and provided with a pressing plate 59b capable of moving up and down. The clamp unit 58 closely adheres the steel plate S to the square frame 12 when the cutter frame 44 descends. ; The air supply pipe 66a mounted to the cutter frame 44 and a plurality of air spray nozzles 66b connected thereto are provided to remove the cutting chips from the steel sheet S during the cutting operation by the milling cutter 48. Air injection unit 65; A mailing table 14b having a plurality of rollers 14c which are moved up and down at a lower portion of the steel sheet S and a cylinder 14d which raises and lowers them, thereby allowing the steel sheet S to flow through; The cylinder 82 is mounted on one side of the square frame 12, and the rod of the cylinder 82 enters and exits a hole formed on the side of the lifting frame 30 to lift the lifting frame 30 with respect to the square frame 12. Lock portion 80 to fix the shanghai copper; And cutting the front end Sa of the steel plate S at a constant inclination angle by being electrically connected to the steel plate detecting unit 26 and the steel plate front end detecting unit 70 and automatically controlling the plurality of motors and the plurality of hydraulic cylinders. A control unit 90 for processing; End mark defect removal device of the cold rolled steel, characterized in that it comprises a. The lifting frame according to claim 1, wherein the control unit 90 divides the end mark (K) from the cold rolled steel sheet (S) for cutting and the cold rolled steel sheet (S) for non-cutting. (30) is raised and the plate tables 14a and 14b are raised so that the cold rolled steel sheet S is plated, and in the case of the cold rolled steel sheet S for cutting work, the lifting frame 30 is lowered and the plate table 14a is raised. End mark defect removal device of the cold rolled steel sheet, characterized in that 14b is lowered and the milling cutter 48 is configured to perform the cutting operation. The cutter transfer cylinder of claim 1, wherein the body of the cutter transfer cylinder 62 is fixed to the square frame 12, and the rod is connected to the cutter frame 44 so that the cutting of the steel sheet S is performed. The cutter frame 44 and the milling cutter 48 travel 200 mm in the width direction of the steel sheet S so that each of the ten milling cutters 48 travels cutting the steel sheet S in the width direction by 200 mm. End mark defect removal device of the cold rolled steel, characterized in that configured. According to claim 1, The cutter frame 44 is pivotally connected to the lower front front side of the fixed plate 42 mounted to the lifting frame 30 through the hinge 45a on the upper front side, the fixed plate on the rear side A pressing bolt 45b protruding downward from the 42 to adjust the length of the cutter frame 44 and presses the upper surface of the cutter frame 44 and extends downward from the fixing plate 42 to the lower side of the cutter frame 44. The mounting angle of the cutter frame 44 is changed with respect to the fixed plate 42 extending horizontally through the through hole 45c and having the support bolt 45e fixed with the nut 45d to be horizontal. Milling cutter (48) of the motor (46) mounted on the) end mark defect removal apparatus of the cold rolled steel sheet, characterized in that configured to change the cutting angle formed with respect to the steel sheet (S). According to claim 1, wherein the steel plate front end detection unit 70 is the upper surface of the rectangular frame 12, when the steel sheet (S) proceeds to contact the rotating plate 76, the rotating plate 76 is to advance the steel plate (S) The spring 74 of the moving plate 73 is moved by the force and is advanced together with the steel sheet S. At the same time, the piano wire 77 is pulled to operate the encoder 78, and in the encoder 78, the piano The electrical signal corresponding to the lead length of the line 77 is transmitted to the controller 90, and the controller 90 is a steel plate 10 of the body portion 10 by the distance input from the encoder 78 An apparatus for removing an end mark defect of a cold rolled steel sheet, characterized in that the servo motor 20 is driven to move toward the tip side of (S). The rotating plate 76 is rotated by the rotary actuator 75, the rotating plate 76 and the moving plate 73 is returned to its original position due to the restoring force of the spring (74). End-duct defect removal device of cold rolled steel sheet. In the method for removing the end mark (K) generated during the winding of the cold rolled steel sheet (S), the step of processing the inclined end (Sa) of the cold rolled steel sheet (S) inclined in front of the winding machine 220 of the cold continuous line. End mark defect removal method of the cold rolled steel sheet to prevent the end mark (K) after the winding, including (100). The method of claim 7, wherein the step (100) comprises the steps of detecting the presence of cold rolled steel sheet (S) (110); Cutting mode step 112; A rising step 116 of the steel plate tip detection unit 70; A rising step 114 of the lifting frame 30; A step 118 in which the safety lock unit 80 is released when the lifting frame 30 reaches the upper limit (Upper Limlt); Outputting a deviation value between the origin and the stop position by the encoder 78 to detect the tip Sa of the steel sheet S; A controller (90) operating the servo drive motor (20) in response to the output signal to move the square frame (12) to the front side of the steel sheet (S) by a deviation amount (122); The dust cover 50 is rotated downward to prevent the fasting chip from scattering 124; Step 126 so that the front end detection unit 70 does not interfere with the plate of the steel sheet (S); When all the conditions of the steps 118, 124 and 126 are satisfied, the cutter rotating motor 46 starts to rotate and the milling cutter 48 rotates; A step 132 in which the lifting frame 30 is lowered inside the rectangular frame 12 by the hydraulic cylinder 36; The air injection nozzle 66b starts to blow the compressed air to the cutter 48 side (134); The milling cutter 48 is lowered to start cutting the steel sheet S (136); After the driving cutting is completed, the lifting frame 30 is raised (138); After the lifting of the lifting frame 30 is completed, the milling cutter 48 is raised at the cutting position to return to the origin 140; A step 142 in which the rectangular frame 12 of the main body 10 returns to the origin at the cutting position; The safety lock unit 80 is operated to lock the lifting frame 30 with respect to the square frame 12 (144); A step 146 in which the dust cover 50 is opened by the opening / closing cylinder 52; And a cycle is completed when all of the same operation is completed; End mark defect removal method of the cold rolled steel sheet to prevent the end mark is characterized in that it is configured to include. The method of claim 8, wherein the rising step 116 of the steel sheet tip detection unit 70 and the lifting step 114 of the lifting frame 30 is made of a cold rolled steel sheet to prevent the end mark is generated How to remove endmark defects. The method of claim 8, wherein the milling cutter 48 is raised at the cutting position to return to the origin 140, and the square frame 12 of the body portion 10 is returned to the origin from the cutting position (142) And, the safety lock unit 80 is operated to lock the lifting frame 30 with respect to the square frame 12 (144), and the dust cover 50 is opened by the opening and closing cylinder 52 (146) ) Is an end mark defect removal method of the cold rolled steel sheet to prevent the end mark is generated, characterized in that at the same time.